SD card

Hi there, i have a 2GB SD card in my Wii, there's some guitar hero songs on there and a couple of games, i just wanted to ask, if i take out the sd card and plug it into my computer.. then plug the SD card back into my Wii will the guitar hero songs and the games still work? the reason i ask is i left a few movies on the SD card and i want to delete them for more room, or is there a way i could delete the videos from the wii? cheers